AT3™ 9mm Straight Profile 8.3 Inch AR-15 Barrel

SKU: AT3-9MM-8.3-28

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Precision Pistol Caliber Performance in a Compact Package

Bring the versatility of 9mm to your AR build with this straight profile 8.3″ barrel from AT3™. Crafted from premium 4150 CrMoV steel per MIL-B-11595E specs and protected by a rugged black nitride finish.

The straight profile adds a balanced weight while maintaining accuracy with 9mm ammunition. At just 8.3″ long with 1/2×28 muzzle threads, it’s an ultra-compact option for dedicated 9mm AR uppers or PDW-style pistol builds.

Specifications

  • Brand: AT3™
  • Model: Straight 8.3″ 9mm Barrel
  • MPN: AT3-9MM-8.3-28
  • Material: 4150 CrMoV Steel (Mil-B-11595E)
  • Finish: Black Nitride
  • Length: 8.3″
  • Twist Rate: 1/10
  • Muzzle Threads: 1/2×28



Have Questions About this Product?


The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

AT3 Lifetime Warranty Logo

All AT3 Tactical Brand Products carry a lifetime warranty against manufacturer’s defects.

This includes AT3 Red Dot SightsHandguardsIron Sights, and any other product that carries the “AT3 Tactical” or “AT3™” name. For other brands (ex. Magpul or Troy), please refer to the manufacturer’s warranty policy.

In the event that your AT3™ product becomes unusable, we will repair or replace the product at no charge to you.

If we cannot repair your product, we will replace it with a product in perfect working order of equal or better physical condition. The warranty is fully transferable, but we may require information about the original purchase to validate the authenticity of the product.

If your product is in need of warranty service, please contact AT3 Tactical to start the process

Our contact info is available here. To expedite processing, please provide your order information and description of the defect.

Please note: The AT3 Lifetime Warranty does not cover loss, theft, intentional damage or cosmetic damage that doesn’t affect the performance of the product.

Customer Reviews

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Tom Szczepaniak
8.3" AR 9mm Barrel

I gave only 4 stars because the barrel was destroying brass trying to chamber it. A bit of polishing to the edge of the chamber with a Dremel and felt tip with compound smoothed out the sharp edge leading into the chamber allowing rounds to chamber smoothly.